public class J04charyunsuan {
    public static void main(String[] args) {
        //ascii码
        System.out.println('a'>'b');//false

        System.out.println('电'>'桌');

        System.out.println('a'+1);
    }
}

class J05az{
    public static void main(String[] args) {
        for (int i = 97; i <= 97+25; i++) {
            System.out.print((char)i);
        }
        for (int i = 48; i <= 48+9; i++) {
            System.out.print((char)i);
        }


    }
}
class J05bijiao{
    public static void main(String[] args) {
        //false
        //1111 1111
        //小数转二进制？，死循环
        System.out.println(0.1+0.2);
        System.out.println(01.+0.2==0.3);
    }
}